Caelestium genus novum (Polygonaceae): обоснование, представленное по результатам молекулярно-филогенетических анализов трибы Polygoneae, предпринятых с учетом вторичной структуры локусов ITS1 и ITS2 ядерной рибосомной ДНК


O. В. Юрцева, Е. В. Мавродиев


DOI: https://doi.org/10.31111/novitates/2019.50.47


Аннотация

Род Bactria, недавно установленный по результатам молекулярного и морфологического исследования трибы Polygoneae для Atraphaxis ovczinnikovii с Южного Памира и Bactria lazkovii с Центрального Тянь-Шаня, может включать также морфологически близкий Polygonum tianschanicum, редкий эндемик Восточного Тянь-Шаня, который ранее не был исследован с молекулярно-филогенетической точки зрения. Чтобы уточнить состав рода Bactria и выяснить филогенетическое положение Polygonum tianschanicum в трибе Polygoneae, мы выполнили молекулярно-филогенетические анализы (метод максимального правдоподобия и Байесов анализ) объединенных участков пластидного генома и участка ITS ядерной рибосомной ДНК для 58 видов Polygoneae, с особым вниманием ко вторичной структуре пре-rRNA локусов ITS1 и ITS2. Во всех наших анализах Bactria lazkovii и Polygonum tianschanicum образовали хорошо поддержанную кладу, сестринскую к Bactria ovczinnikovii в пластидных деревьях, но обособленную от последнего вида (как и от прочих родов Polygoneae) в анализе ITS. Детали вторичной структуры pre-rRNA локусов ITS1 и ITS2 также показали тесное родство Bactria lazkovii и Polygonum tianschanicum, равно как и их существенные отличия от Bactria ovczinnikovii. Результаты молекулярных анализов пластидных и ядерных участков, различия вторичной структуры pre-rRNA локусов ITS1 и ITS2, морфологические отличия и географическое распространение позволяют выделить новый для науки род Caelestium Yurtseva et Mavrodiev. Род имеет предположительно гибридогенное происхождение и включает два узколокальных эндемика Тянь-Шаня: C. lazkovii (= Bactria lazkovii) из Кыргызстана и C. tianschanicum (= Polygonum tianschanicum) из Северо-Восточного Китая. Полученные результаты обсуждаются в контексте уточненного состава трибы Polygoneae, который определяется на основании интерпретации результатов молекулярно-филогенетических анализов.


Ключевые слова: Polygoneae, Atraphaxis, Bactria, Caelestium, new genus, неконгруэнтность, молекулярный анализ, псевдоген, rpl32-trnL(UAG), вторичная структура pre-rRNA, trnL–F, Памир, Тянь-Шань


Цитирование статьи

Юрцева O. В., Мавродиев Е. В. 2019. Caelestium genus novum (Polygonaceae, Polygoneae): обоснование, представленное по результатам молекулярно-филогенетических анализов трибы Polygoneae, предпринятых с учетом вторичной структуры локусов ITS1 и ITS2 ядерной рибосомной ДНК // Новости сист. высш. раст. Т. 50. С. 47–79. https://doi.org/10.31111/novitates/2019.50.47


Поступила в редакцию: 26.07.2019. Принята к публикации: 14.12.2019.


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Дополнительные материалы

Appendix. Taxa and GenBank accession numbers for the genetic data (ITS, rpl32-trnL(UAG), trnL-trnF) downloadded and generated for this study.
NSPV-50_5-Yurtseva_Mavrodiev-Appendix